How to form a new array with every three elements in php

In PHP programming, we often need to operate arrays. One of the common tasks is to split a large array into multiple small arrays according to certain rules, which can facilitate our data processing and display. In this article, we will introduce how to use PHP to form a new array every three elements of an array.

1. Use the array_chunk function

The array_chunk function is a built-in function in PHP. It can split an array into multiple sub-arrays according to the specified size and return a new array composed of these sub-arrays. array. Therefore, we can use the array_chunk function to split the original array into multiple sub-arrays for every three elements. The sample code is as follows:

<?php
$original_array = array(1,2,3,4,5,6,7,8,9,10,11,12);
$new_array = array_chunk($original_array, 3);
print_r($new_array);
?>

After running the above code, the output result is:

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
        )

    [1] => Array
        (
            [0] => 4
            [1] => 5
            [2] => 6
        )

    [2] => Array
        (
            [0] => 7
            [1] => 8
            [2] => 9
        )

    [3] => Array
        (
            [0] => 10
            [1] => 11
            [2] => 12
        )

)

It can be seen that the original array was successfully split into four sub-arrays based on every three elements, and each sub-array contains three elements.

2. Use for loop implementation

In addition to using ready-made functions, we can also manually write code to split the original array into multiple sub-arrays for every three elements. The following is an implementation method based on a for loop:

<?php
$original_array = array(1,2,3,4,5,6,7,8,9,10,11,12);
$new_array = array();
for($i = 0; $i < count($original_array); $i += 3) {
    $sub_array = array_slice($original_array, $i, 3);
    array_push($new_array, $sub_array);
}
print_r($new_array);
?>

In the above code, we use a for loop to traverse the original array, taking out three elements each time and putting them into a new array as subarrays. Among them, the array_slice function is used to take out the 3 elements starting from $i, and the array_push function is used to add the subarray to the new array.

Compared with the array_chunk function, this method is more controllable and suitable for some special scenarios. For example, if we need to add a specific element at the end of each sub-array, we can modify the steps of the for loop. It will take a long time to achieve.

3. Summary

In PHP, forming a new array with every three elements of an array can be achieved using the array_chunk function and a for loop. We can choose the appropriate method according to actual needs to process and display data more efficiently.

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